33On the other hand, it is indeed appropriate to apply the principle of pro rata temporis, set out in Clause 4.2 of the framework agreement on part-time work, to the grant of annual leave for a period of employment on a part-time basis. For such a period, the reduction of annual leave by comparison to that granted for a period of full-time employment is justified on objective grounds. However, that principle cannot be applied ex post to a right to annual leave accumulated during a period of full-time work.
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